For a particular scientific experiment, it is important to be completely isolated from any magnetic field, including the earth's field. The earth's field is approximately 50 μT, but at any particular location it may be a bit more or less than this. A 1.00-m-diameter current loop with 200 turns of wire is adjusted to carry a current of 0.211 A ; at this current, the coil's field at the center is exactly equal to the earth's field in magnitude but opposite in direction, so that the total field at the center of the coil is zero. What is the strength of the earth's magnetic field at this location?
Express your answer to two significant figures and include the appropriate units.

The magnetic field at the center of the coil is  

Explanation:

   From the question we are told that

         The magnetic field of earth is

         The diameter of the wire is  

        The radius is

         The number of turn is  

         The current it is carrying is  

The earth magnetic field strength at the center of the coil is mathematically represented as

Where is the permeability of free space

So  

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.